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Hybrid de novo genome assembly of red gromwell () reveals evolutionary insight into shikonin biosynthesis. | LitMetric

AI Article Synopsis

Article Abstract

(red gromwell; zicao) is a medicinal and economically valuable plant belonging to the Boraginaceae family. Roots from have been used for centuries based on the antiviral and wound-healing properties produced from the bioactive compound shikonin and its derivatives. More recently, shikonin, its enantiomer alkannin, and several other shikonin/alkannin derivatives have collectively emerged as valuable natural colorants and as novel drug scaffolds. Despite several transcriptomes and proteomes having been generated from , a reference genome is still unavailable. This has limited investigations into elucidating the shikonin/alkannin pathway and understanding its evolutionary and ecological significance. In this study, we obtained a de novo genome assembly for using a combination of Oxford Nanopore long-read and Illumina short-read sequencing technologies. The resulting genome is ∼367.41 Mb long, with a contig N50 size of 314.31 kb and 27,720 predicted protein-coding genes. Using the genome, we identified several additional -hydroxybenzoate:geranyltransferase (PGT) homologs and provide insight into their evolutionary history. Phylogenetic analysis of prenyltransferases suggests that PGTs originated in a common ancestor of modern shikonin/alkannin-producing Boraginaceous species, likely from a retrotransposition-derived duplication event of an ancestral prenyltransferase gene. Furthermore, knocking down expression of in hairy root lines revealed that LePGT1 is predominantly responsible for shikonin production early in culture establishment. Taken together, the reference genome reported in this study and the provided analysis on the evolutionary origin of shikonin/alkannin biosynthesis will guide elucidation of the remainder of the pathway.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7261806PMC
http://dx.doi.org/10.1038/s41438-020-0301-9DOI Listing

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